题目内容
直接写出得数
|
2-
| ||||||||
| 6.5-2.8= | 0.25×3.2= | ||||||||
|
| ||||||||
化简比:0.75:
|
求比值:
|
分析:①
+
,同分母分数相加,把分子相加,分母不变;②2-
,把2化成分数1
;③6.5-2.8,注意借位;
④0.25×3.2,把3.2拆成4×0.8,利用乘法结合律简算;⑤
×
,注意约分;⑥
÷
,先化为乘法在计算;
⑦0.75:
,要求化简比,把0.75化为
,然后除以
,把所得的结果化为比的形式;⑧
:
,要求求比值,先把比号改为除号,最后把结果写成整数、小数或分数的形式.
| 2 |
| 5 |
| 1 |
| 5 |
| 3 |
| 7 |
| 7 |
| 7 |
④0.25×3.2,把3.2拆成4×0.8,利用乘法结合律简算;⑤
| 3 |
| 8 |
| 4 |
| 9 |
| 5 |
| 9 |
| 5 |
| 6 |
⑦0.75:
| 5 |
| 8 |
| 3 |
| 4 |
| 5 |
| 8 |
| 7 |
| 12 |
| 7 |
| 9 |
解答:解:①
+
=
;
②2-
=1
;
③6.5-2.8=3.7;
④0.25×3.2=0.8;
⑤
×
=
;
⑥
÷
=
;
⑦0.75:
=
×
=
=6:5;
⑧
:
=
×
=
.
| 2 |
| 5 |
| 1 |
| 5 |
| 3 |
| 5 |
②2-
| 3 |
| 7 |
| 4 |
| 7 |
③6.5-2.8=3.7;
④0.25×3.2=0.8;
⑤
| 3 |
| 8 |
| 4 |
| 9 |
| 1 |
| 6 |
⑥
| 5 |
| 9 |
| 5 |
| 6 |
| 2 |
| 3 |
⑦0.75:
| 5 |
| 8 |
| 3 |
| 4 |
| 8 |
| 5 |
| 6 |
| 5 |
⑧
| 7 |
| 12 |
| 7 |
| 9 |
| 7 |
| 12 |
| 9 |
| 7 |
| 3 |
| 4 |
点评:此题考查了分数、小数的加减乘除运算能力,以及化简比、求比值的方法.
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